cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A139408 Numbers n such that phi(n)=d_1!!*d_2!!*...*d_k!! where d_1 d_2 ... d_k is the decimal expansion of n.

Table of values

n a(n)
1 1
2 260
3 450
4 543
5 630
6 1164
7 2080
8 3534
9 3640
10 4525
11 5425
12 11176
13 13365
14 15407
15 18333
16 24056
17 24552
18 25064
19 25452
20 26352
21 30660
22 37324
23 45136
24 46160
25 46325
26 49321
27 51742
28 52080
29 54540
30 67122
31 76041
32 76151
33 80325
34 81060
35 81217
36 81532

List of values

[1, 260, 450, 543, 630, 1164, 2080, 3534, 3640, 4525, 5425, 11176, 13365, 15407, 18333, 24056, 24552, 25064, 25452, 26352, 30660, 37324, 45136, 46160, 46325, 49321, 51742, 52080, 54540, 67122, 76041, 76151, 80325, 81060, 81217, 81532]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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